[R] boxplot question

[Jim Lemon]

Christine Serres wrote:

Can anyone tel me how to plot two boxplot at the same abscisse value
?...

I may be mistaken, but I think you mean on equivalent ordinates.  If so,
here's a start.

test1<-rnorm(100)
test2<-rnorm(100)
par(mfcol=c(1,2),mar=c(5,6,4,2))
ymin<-floor(min(c(test1,test2)))
ymax<-ceiling(max(c(test1,test2)))
boxplot(test1,ylim=c(ymin,ymax))
par(mar=c(5,4,4,4))
boxplot(test2,ylim=c(ymin,ymax))
par(mfcol=c(1,1),mar=c(5,4,4,2))
rm(test1,test2)

This simply puts two boxplots side by side with the same ordinates.  In
doing this, I discovered that you can't turn off the box in boxplot
(d'oh!) and thus I couldn't work out a way to plot the two boxless
boxplots, then wrap an empty frame around them.  Virtual applause for
the one who cracks that.

Jim

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